DE102011054993A1 - Device and method for cooling a drive unit in a hybrid vehicle - Google Patents

Device and method for cooling a drive unit in a hybrid vehicle Download PDF

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Publication number
DE102011054993A1
DE102011054993A1 DE102011054993A DE102011054993A DE102011054993A1 DE 102011054993 A1 DE102011054993 A1 DE 102011054993A1 DE 102011054993 A DE102011054993 A DE 102011054993A DE 102011054993 A DE102011054993 A DE 102011054993A DE 102011054993 A1 DE102011054993 A1 DE 102011054993A1
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DE
Germany
Prior art keywords
temperature
drive unit
water pump
cooling
determining
Prior art date
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Withdrawn
Application number
DE102011054993A
Other languages
German (de)
Inventor
Junyong Lee
Chikung Ahn
Daekwang Kim
Minyoung Jung
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Hyundai Motor Co
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Hyundai Motor Co
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Filing date
Publication date
Priority to KR1020110068391A priority Critical patent/KR20130007819A/en
Priority to KR10-2011-0068391 priority
Application filed by Hyundai Motor Co filed Critical Hyundai Motor Co
Publication of DE102011054993A1 publication Critical patent/DE102011054993A1/en
Withdrawn legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00Control systems specially adapted for hybrid vehicles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K11/00Arrangement in connection with cooling of propulsion units
    • B60K11/02Arrangement in connection with cooling of propulsion units with liquid cooling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L1/00Supplying electric power to auxiliary equipment of vehicles
    • B60L1/003Supplying electric power to auxiliary equipment of vehicles to auxiliary motors, e.g. for pumps, compressors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L1/00Supplying electric power to auxiliary equipment of vehicles
    • B60L1/02Supplying electric power to auxiliary equipment of vehicles to electric heating circuits
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
    • B60W30/18Propelling the vehicle
    • B60W30/184Preventing damage resulting from overload or excessive wear of the driveline
    • B60W30/1843Overheating of driveline components
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00Liquid cooling
    • F01P3/20Cooling circuits not specific to a single part of engine or machine
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00Controlling of coolant flow
    • F01P7/14Controlling of coolant flow the coolant being liquid
    • F01P7/16Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/165Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00Controlling of coolant flow
    • F01P7/14Controlling of coolant flow the coolant being liquid
    • F01P7/16Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/167Controlling of coolant flow the coolant being liquid by thermostatic control by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine speed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00Control parameters of input or output; Target parameters
    • B60L2240/10Vehicle control parameters
    • B60L2240/36Temperature of vehicle components or parts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00Control parameters of input or output; Target parameters
    • B60L2240/40Drive Train control parameters
    • B60L2240/42Drive Train control parameters related to electric machines
    • B60L2240/425Temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2050/00Applications
    • F01P2050/24Hybrid vehicles
    • Y02T10/642

Abstract

Apparatus and method for cooling a power pack in a hybrid vehicle circulating cooling water discharged from an internal combustion engine by connecting the engine to a radiator (12) via a first cooling water passage, the apparatus comprising a drive unit (21) providing driving information of the engine Vehicle detects and controls the operation of the internal combustion engine and an electric motor, a low-temperature radiator (22) which is connected via a second cooling water passage with the drive unit (21) and arranged parallel to the radiator (12) and heat of the of the drive unit (21) omitted Cooling water dissipates, and an electric water pump (23), which is arranged in the second cooling water channel and is operated in response to an output from an electronic control unit ECU (25) electrical signal to the cooling water through the drive unit (21) and the low-temperature radiator (22) h to circulate through it.

Description

  • For the registration will be the priority of July 11, 2011 submitted Korean Patent Application No. 10-2011-0068331 the entire contents of which are incorporated herein by reference.
  • The invention relates to a cooling device in a hybrid vehicle, and in particular to a device and a method for cooling a power pack in a hybrid vehicle, with which only a drive unit can be cooled, which controls energy in the hybrid vehicle.
  • As very fuel-efficient and environmentally friendly vehicles, the focus in the vehicle industry is increasingly on hybrid vehicles, which use both an internal combustion engine and an electric motor as energy supply.
  • Such hybrid vehicles are equipped with a power pack which is a single control device for controlling the drive of the engine and the electric motor, and the drive unit collects driving information of the vehicle and determines which of the motors is used for driving.
  • Since the drive unit generates heat during operation, the heat must be dissipated so that the drive unit can be operated without being damaged.
  • In particular, a lightweight hybrid vehicle that is highly dependent on the internal combustion engine uses engine cooling water to cool the prime mover.
  • 1 shows a conventional device for cooling a drive unit in a hybrid vehicle. Regarding 1 A conventional engine cooling device circulates cooling water between an engine 111 and a cooler 112 by means of a mechanical water pump 113 while the cooling water by means of a thermostat 114 is controlled. In the engine cooling device additionally branches a cooling water passage from the outlet of the radiator 112 from, and the cooling water is by means of an electric water pump 123 in a drive unit 121 circulated. Part of the cooling water coming out of the engine 111 is discharged is controlled so that it by means of a valve 116 , which can be used to heat the interior, circulates in a heater.
  • However, with the conventional apparatus for cooling the prime mover in a hybrid vehicle, the one from the radiator 112 Exhausted cooling water directly in the drive unit 121 circulated. Accordingly, the cooling performance decreases, and as a result of the operation of the electric water pump 123 creates a high energy loss. That from the radiator 112 Exhausted cooling water has a relatively lower temperature than that from the engine 111 skipped cooling water, however, the temperature is still high, so that the cooling water is not suitable for cooling and the cooling capacity is reduced accordingly. For example, the cooling water temperature of the power plant becomes 121 controlled within 95 ° C to 100 ° C, if a medium or greater load on the engine 111 is exercised so that it can be seen that the cooling capacity drops considerably.
  • As it is necessary, the electric water pump 123 To keep in operation, a large loss of energy is generated.
  • As a result of this problem, there is a limitation in the driving range of the hybrid vehicle.
  • The invention provides an apparatus and a method for cooling a drive unit in a hybrid vehicle, which are controlled individually and efficiently in order to cool the drive unit of the hybrid vehicle.
  • According to one aspect of the invention, a device for cooling a power pack in a hybrid vehicle includes a power plant, a low-temperature radiator and a pump such as an electric water pump. The drive unit controls the operation of an internal combustion engine and an electric motor by detecting driving information of the vehicle. The low-temperature radiator is connected to the engine via a cooling passage such as a cooling water passage, discharges heat from the cooling water discharged from the engine, and is arranged in parallel to a radiator. The electric water pump is disposed in the cooling water passage and is operated in response to an electric signal output from an electronic control unit (ECU) to circulate the cooling water or other suitable cooling liquids through the engine and the low-temperature radiator.
  • The apparatus may further include a cooling fan controlled by the ECU to introduce outside air into the low-temperature radiator.
  • Optionally, the cooling fan may be controlled by pulse width modulation (PWM) control which controls the speed of the cooling fan in consideration of the temperature of the power plant and the speed of the vehicle, or be controlled by an on / off control, which controls the operation of the cooling fan.
  • The low temperature radiator may be positioned in front of the radiator in the vehicle.
  • The electric water pump can be controlled such that the speed is determined by the temperature of the drive unit.
  • According to another aspect of the invention, a method of cooling a power pack in a hybrid vehicle includes determining the start of a water pump, operating the water pump, and determining engine operation. The step of determining the start of a water pump determines, by detecting driving information of a hybrid vehicle, whether the temperature of a prime mover is above a first temperature set for starting the electric water pump. The step of operating the water pump operates the electric water pump such that the cooling water or other suitable cooling fluid circulates through the prime mover and the low temperature radiator when the temperature of the prime mover is above the first temperature in the step of determining the start of the water pump. The step of determining engine operation determines whether the engine of the hybrid vehicle is operating and, and proceeds to the step of determining the start of the water pump when the engine is in operation.
  • The method may further include determining the start of a cooling fan determining whether the temperature of the prime mover is above a second temperature, determining the start of the cooling fan after determining the start of the water pump, and the second temperature higher than the first Temperature is set, and have the operation of the cooling fan, wherein the cooling fan is operated, when determining the start of the cooling fan, the temperature of the drive unit is above the second temperature.
  • In operating the cooling fan, pulse width modulation (PWM) control which controls the speed of the cooling fan in consideration of the temperature of the power plant and the speed of the vehicle or on / off control which controls the operation of the cooling fan may optionally be used.
  • Checking the water pump, determining whether there is a fault in the electric water pump, may be performed before determining the start of the water pump, and determining the start of the water pump may be performed when it is determined when checking the water pump the electric water pump is in a normal state.
  • Determining the entry into a safety mode in which it is determined whether the temperature of the prime mover is above a first temperature is performed when it is determined when checking the water pump that the electric water pump is not in a normal state. The operation in a safety mode, in which the drive unit is operated in a safety mode, is performed when it is determined in determining the entry into the safety mode that the temperature of the drive assembly is above the first temperature. The operation in a normal mode in which the power plant is operated in the normal mode is performed when it is determined in determining the entry into the safety mode that the temperature of the prime mover is equal to or below the first temperature.
  • When operating the water pump, the speed of the electric water pump is controlled by the drive unit and determined by the temperature of the drive unit.
  • With the apparatus and method for cooling a prime mover in a hybrid vehicle according to various exemplary embodiments of the invention, it is possible to improve the cooling performance by independently circulating the low temperature cooling water in the prime mover since a main radiator discharges the cooling water discharged from the engine cools, and a subcooler, which cools only the drive unit, are separated.
  • The temperature of the circulating in the drive unit cooling water is considerably lower than that of the cooling water from the engine, which leads to an increase in the efficiency of the drive unit.
  • The apparatus can be operated in a high temperature area so that it is possible to expand the usable area in which the hybrid vehicle can travel.
  • Since it is possible to design the components in the drive unit for a low allowable temperature, the degree of freedom of the design is increased.
  • The invention will be explained in more detail with reference to the drawing. In the drawing show:
  • 1 a schematic view of a conventional device for cooling a drive unit in a hybrid vehicle;
  • 2 a schematic view of an apparatus for cooling a drive unit in a hybrid vehicle according to an exemplary embodiment of the invention; and
  • 3 a flowchart for explaining a method for cooling a drive unit in a hybrid vehicle according to an exemplary embodiment of the invention.
  • With reference to the drawing, an apparatus for cooling a power plant in a hybrid vehicle according to an exemplary embodiment of the invention will be described.
  • The cooling device according to the invention is arranged independently of a conventional engine cooling device, the cooling water or other suitable cooling liquids between a motor 11 and a cooler 12 by means of a pump, such as a mechanical water pump 13 , circulates.
  • That is, the cooling device according to the invention has, as in 2 shown a power pack 21 , a low-temperature cooler 22 , via a coolant channel, such as a cooling water channel, with the drive unit 21 connected and dissipates the heat of the cooling water or other cooling fluids, and a pump, such as an electric water pump 23 , on, in the cooling water channel between the drive unit 21 and the low temperature cooler 22 is arranged and the cooling water circulates.
  • The drive unit 21 is a component of a hybrid vehicle that controls power for driving the internal combustion engine and the electric motor of a hybrid vehicle. The drive unit 21 generates heat by driving a vehicle. When the temperature of the drive unit 21 exceeds a predetermined temperature, the parts in the drive unit 21 be damaged, and the efficiency can be reduced. Therefore, the drive unit 21 be cooled to a temperature below the predetermined temperature.
  • The low temperature cooler 22 is with the drive unit 21 connected via the cooling water channel, which forms a circuit that allows the cooling water or other suitable cooling fluids through the drive unit 21 and the low temperature cooler 22 circulated through. In this exemplary configuration, the cooling water flows from the engine 11 to the radiator 12 , and the heat of the cooling water is through the radiator 12 dissipated while the cooling water from the drive unit 21 to the low temperature cooler 22 flows and the heat of the cooling water through the low-temperature cooler 22 is dissipated. The cooler 22 is referred to as a low-temperature radiator, since the temperature of the cooling water from the drive unit 21 usually lower than that of the cooling water from the engine 11 is.
  • The low temperature cooler 22 generally has a capacity lower than that of the cooler 12 is, and can be parallel to the radiator 12 and / or in front of the radiator 12 be positioned. Such a construction allows that through the low-temperature radiator 22 passing cooling water first comes into contact with the outside air, since the cooling water has a lower temperature than that through the radiator 12 has passing through cooling water. When the cooler 12 in front of the low temperature cooler 22 is positioned, the outside air is through contact with the radiator 12 heated and then passes with the low-temperature cooler 22 in contact, so that the heat exchange capacity decreases. Therefore, the low temperature cooler should 22 in front of the radiator 12 be positioned.
  • A pump, like an electric water pump 23 , is arranged in the cooling water passage, which is the drive unit 21 with the low temperature cooler 22 combines. The electric water pump 23 operated in response to an electrical signal operates when an operating signal is supplied from outside to circulate the cooling water.
  • This configuration may further include a cooling fan 24 Provide for the heat dissipation of the radiator 12 and the low temperature cooler 22 to support. The cooling fan 24 Supports the cooling of the cooling water by blowing the outside air to the low temperature cooler 22 if the cooling water is not just through circulation of the through the low-temperature cooler 22 passing cooling water can be cooled and when the required amount of cooling is large, as in the case in which a vehicle is traveling at a low speed.
  • The electric water pump 23 and the cooling fan 24 are handled by an electronic control unit (ECU) 25 controlled. The ECU 25 determined on the basis of temperature information provided by the drive unit 21 (a) Receive whether the electric water pump 23 or the cooling fan 24 works, and sends a control signal to the electric water pump 23 (b) or to operate the cooling fan (c). For example, determines when the temperature of the drive unit 21 is entered, the ECU 25 the speed of the electric water pump 23 , the temperature of the drive unit 21 corresponds, and outputs a control signal corresponding to the voltage control value that matches the rotational speed by means of a protocol such as a CAN (Controller Area Network) or a LIN (Local Interconnect Network).
  • When the cooling fan 24 is controlled, controls the ECU 25 the cooling fan 24 by PWM (Pulse Width Modulation) control or on / off control by determining the voltage control value for operating the cooling fan 24 taking into account the vehicle speed and the temperature of the drive unit 21 , That is, the voltage control value is determined from a previously prepared table, which shows the vehicle speed and the temperature of the prime mover 21 and is optionally used for PWM control or on / off control. It is possible the amount of through the cooling fan 24 passing air by controlling the speed of the cooling fan 24 operating motor by means of the PWM control or the cooling fan 24 by means of the on / off control every time the cooling fan 24 must work, operate.
  • The reference numerals 15 and 16 denote a heater and a valve for heating the interior by means of the heat of the cooling water of the engine 11 be used.
  • Hereinafter, a method of cooling a power plant in a hybrid vehicle according to an exemplary embodiment of the invention will be described.
  • As in 3 1, the method includes determining the start of a water pump in S120, operating the water pump in S130, and determining engine operation in S160. By determining the start of a water pump in S 120, it is determined whether the temperature of the cooling water is above a first temperature T 1 to start the water pump 23 By operating the water pump in S130, the electric water pump is set 23 operated, when the temperature of the power plant is above the first temperature T1, by determining an engine operation in S160, it is determined whether the engine 11 of the hybrid vehicle, and determining the start of the water pump in S120 is performed again when the engine 11 is in operation.
  • By determining the start of the water pump in S120, it is determined whether the temperature of the cooling water flowing through the prime mover 21 and the low temperature cooler 22 circulates above the first temperature T1, which is to start the electric water pump 23 is fixed. When the temperature is above the first temperature T1, the electric water pump becomes 23 operated such that the cooling water through the drive unit 21 and the low temperature cooler 22 circulated through, causing the drive unit 21 , which generates heat, is cooled. When the electric water pump 23 works, the cooling water takes heat from the drive unit 21 on, and the heat gets over the low-temperature cooler 22 dissipated while the cooling water between the drive unit 21 and the low temperature cooler 22 circulates, leaving the drive unit 21 maintain a reasonable temperature.
  • Otherwise, if the temperature of the drive unit 21 is equal to or below the first temperature T1, the electric water pump 23 not operated. The reason for this is that the efficiency is high when the drive unit 21 operates in a reasonable temperature range, and accordingly, when the temperature of the drive unit 21 is equal to or below the first temperature T1, the electric water pump 23 not operated until the temperature of the drive unit 21 rises beyond the appropriate temperature range.
  • It is preferable to perform the checking of the water pump in S110 before performing the determination of the start of a water pump in S120, thereby determining whether the electric water pump 23 is in the normal state. For example, by detecting a disconnection or a short circuit of a control signal line which the ECU 25 with the electric water pump 23 electrically connects, checked if the ECU 25 the electric water pump 23 can control normally. The operation of the water pump in S130, which will be described later, is performed only when it is determined in checking the water pump in S110 that the electric water pump 23 is in the normal state.
  • Operating the water pump in S130 allows the cooling water between the drive unit 21 and the low temperature cooler 22 by operating the electric water pump 23 circulates when the temperature of the drive unit 21 is above the first temperature T1. When the cooling water through the drive unit 21 and the low temperature cooler 22 circulates through, the cooling water takes heat from the drive unit 21 and transfers the heat via the low-temperature cooler 22 off, leaving the drive unit 21 is kept within a reasonable temperature range.
  • By determining the engine operation in S160, it is determined whether the engine 11 In operation, determining the start of a water pump is performed in S120 when the engine 11 is in operation, or the control is terminated when the engine 11 is stopped.
  • When the temperature of the drive unit 21 above a certain temperature, it is difficult to drive the unit 21 merely by circulating the cooling water through the drive unit 21 and the low temperature cooler 22 through with the electric water pump 23 to cool. To the drive unit 21 effectively cooling, determining the start of a cooling fan in S140 and operating a cooling fan in S150, whereby the cooling fan 24 operated to perform the cooling by operating the cooling fan 24 to support.
  • By determining the start of a cooling fan in S140, it is determined whether the temperature of the prime mover 21 is above a fixed second temperature T2. The second temperature T2 is set higher than the first temperature T1 and is used as a determination basis for the additional operation of the cooling fan 24 used when the drive unit 21 can not be sufficiently cooled only by simple circulation of the cooling water.
  • Operating the cooling fan in S150 turns on the cooling fan 24 additionally operated when it is determined in determining the start of the cooling fan in S140, that the temperature of the drive unit 21 is above the second temperature T2. The temperature of the drive unit 21 is normally above the first temperature T1 when it is above the second temperature T2, so that the cooling fan 24 additionally operated while the electric water pump 23 is working. When the cooling fan 24 works, the outside air is in the low-temperature cooler 22 introduced, so that the heat dissipation capacity of the low-temperature radiator 22 increases and the cooling capacity of the drive unit 21 is improved. When the vehicle speed is low, it is possible to use the cooling fan 24 to operate even if the amount of outside air in the low-temperature cooler 22 is introduced, is low. Accordingly, the characteristics of the control of the cooling fan 24 the temperature of the drive unit and the speed of the vehicle.
  • If when checking the water pump in S110 it is determined that the electric water pump 23 is in an abnormal state, it is determined whether the temperature of the prime mover is set by performing the determination of entering a safety mode in S170 21 is above the first temperature T1.
  • If it is determined in determining the entry to the safety mode in S170 that the temperature of the prime mover 21 is equal to or below the first temperature T1, it is not necessary, the drive unit 21 to cool. In this case, the electric water pump 23 is not operated, and the operation proceeds to operate in a normal drive unit mode in S172.
  • If it is determined in determining the entry to the safety mode in S170 that the temperature of the prime mover 21 is above the first temperature T1, the cooling water is passed through the electric water pump 23 circulates, or the cooling fan 24 is operated so that the drive unit 21 in safety mode in S171.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • KR 10-2011-0068331 [0001]

Claims (11)

  1. Device for cooling a power pack in a hybrid vehicle, the cooling water discharged from an internal combustion engine by connecting the internal combustion engine to a radiator ( 12 ) is circulated via a first cooling water channel, the device comprising: a drive unit ( 21 ), which detects driving information of the vehicle and controls the operation of the internal combustion engine and an electric motor; a low temperature cooler ( 22 ), which via a second cooling water channel with the drive unit ( 21 ) and parallel to the radiator ( 12 ) is arranged and heat of the drive unit ( 21 ) discharges discharged cooling water; and an electric water pump ( 23 ) disposed in the second cooling water passage and in response to an electronic control device ECU ( 25 ) is operated to supply the cooling water through the drive unit ( 21 ) and the low-temperature cooler ( 22 ) to circulate through.
  2. Apparatus according to claim 1, further comprising a cooling fan ( 24 ) issued by the ECU ( 25 ) to supply outside air to the low temperature radiator ( 22 ) introduce.
  3. Apparatus according to claim 2, wherein the cooling fan ( 24 ) optionally by a pulse width modulation (PWM) control, the speed of the cooling fan ( 24 ) taking into account the temperature of the drive unit ( 21 ) and a speed of the vehicle, or by an on / off control, the operation of the cooling fan ( 24 ) is controlled, controlled.
  4. Apparatus according to claim 1, wherein the low temperature radiator ( 22 ) in front of the radiator ( 12 ) is positioned in the vehicle.
  5. Device according to claim 1, wherein the electric water pump ( 23 ) is controlled such that a rotational speed by a temperature of the drive unit ( 21 ) is determined.
  6. A method of cooling a power pack in a hybrid vehicle using the apparatus of any one of claims 1 to 5, the method comprising: determining the start of a water pump, wherein a temperature of the power plant ( 21 ) and the electric water pump ( 23 ) is started when the temperature of the drive unit ( 21 ) is above a first temperature (T1); Operating the water pump, the electric water pump ( 23 ) is operated such that the cooling water through the drive unit ( 21 ) and the low-temperature cooler ( 22 ) is circulated through, when determining the start of the water pump, the temperature of the drive unit ( 21 ) is above the first temperature (T1); and determining an engine operation, determining whether the engine is ( 11 ) of the vehicle is in operation, and is passed to determine the start of the water pump when the engine ( 11 ) is in operation.
  7. The method of claim 6, further comprising: determining the start of a cooling fan ( 24 ), wherein it is determined whether the temperature of the drive unit ( 21 ) is above a second temperature (T2), determining the start of the cooling fan ( 24 ) is performed after determining the start of the water pump, and the second temperature (T2) is set higher than the first temperature (T1); and operating the cooling fan ( 24 ), with the cooling fan ( 24 ) is operated when determining the start of the cooling fan ( 24 ) the temperature of the drive unit ( 21 ) is above the second temperature (T2).
  8. Method according to claim 7, wherein during operation of the cooling fan ( 24 ) optionally a pulse width modulation (PWM) control, the speed of the cooling fan ( 24 ) taking into account the temperature of the drive unit ( 21 ) and a speed of the vehicle controls, or an on / off control, the operation of the cooling fan ( 24 ) is used.
  9. The method of claim 6, further comprising: checking the water pump, determining whether there is a fault in the electric water pump ( 23 ), the checking of the water pump is performed before the determination of the start of the water pump, and the determination of the start of the water pump is performed if, when checking the water pump, the electric water pump ( 23 ) is in a normal state.
  10. The method of claim 9, further comprising: determining entry into a safety mode determining whether the temperature of the power plant ( 21 ) is above the first temperature (T1), and determining the entry into the safety mode is performed when, when checking the water pump, the electric water pump ( 23 ) is not in the normal state; Operating in the safety mode, wherein the drive unit ( 21 ) is operated in the safety mode when determining the entry into the Safety mode the temperature of the drive unit ( 21 ) is above the first temperature (T1); and operating in a normal mode, wherein the drive unit ( 21 ) is operated in the normal mode if, when determining the entry into the safety mode, the temperature of the drive unit ( 21 ) is equal to or below the first temperature (T1).
  11. Method according to claim 6, wherein, when the water pump is operated, the rotational speed of the electric water pump ( 23 ) by the drive unit ( 21 ) is controlled by the temperature of the drive unit ( 21 ) is determined.
DE102011054993A 2011-07-11 2011-11-02 Device and method for cooling a drive unit in a hybrid vehicle Withdrawn DE102011054993A1 (en)

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